Phys.org October 19, 2024 Optical Stark effect is an example of using Floquet engineering for optical trapping of atoms and breaking time-reversal symmetry in solids. However, floquet engineering typically requires high field intensities obtained in ultrafast pulses, severely limiting its use. An international team of researchers (USA – University of Michigan, Japan, Taiwan) demonstrated using cavity engineering of the vacuum modes to achieve Floquet effects at an extremely low fluence of 450 photons/μm2. At higher fluences, the cavity-enhanced Floquet effects led to 50 meV spin and valley splitting of WSe2 excitons, corresponding to an enormous time-reversal breaking. They demonstrated an […]
Tag Archives: Floquet engineering
Floquet engineering tunes ultracold molecule interactions and produces two-axis twisting dynamics
Phys.org September 12, 2024 Polar molecules confined in an optical lattice are a versatile platform to explore spin-motion dynamics based on strong, long-range dipolar interactions. A team of researchers in the US (University of Colorado, Harvard University, industry) used Floquet engineering to realize new quantum many-body systems of polar molecules. Using a spin encoded in the two lowest rotational states of ultracold 40K87Rb molecules, they mutually validated XXZ spin models tuned by a Floquet microwave pulse sequence against those tuned by a d.c. electric field. This validation sets the stage for the realization of Hamiltonians inaccessible with static fields. They […]